摘要
以手把体为例,综合考虑应变速率及变形温度对材料微观组织结构和性能的影响,运用DEFORM材料库中的应力应变数据,建立了45钢的热加工图,初步为手把体锻造提供合适的工艺参数范围.进一步以初始锻造温度、飞边槽桥部高度、模具下压速率为优化变量,以锻件最大损伤值、终锻成形载荷、坯料填充率为优化目标,采用Design-Expert软件进行了响应面拟合建模分析,得到三个目标量的二阶响应面模型,并进行优化分析,经数值模拟验证其误差范围小于5%.生产实践结果表明:多目标优化后的工艺参数能够获得形貌完整的锻件,并有效地减小最大损伤值,降低成形载荷,显著地提高了材料利用率.
Take the forging of handlebar as an example ,the effects of strain rate and deformation tem‐perature on microstructure were considered .The processing map of 45 steel was established based on the data of stress‐strain curves acquired from the material depot of DEFORM simulation software . Firstly ,appropriate scope of technological parameters was achieved by the processing map . Then using the Design‐Expert software ,the quadratic response surface model of maximum damage ,forming load and filling completeness were established by taking the simulation results as responses while the parameters of forming temperature ,flash cave size ,and deformation speed as variables .Finally ,the model was used for optimization analysis .The error range was less than 5% as a result of the numeri‐cal simulation validation .Production practice shows that intact forgings can be produced using the technological parameters after multi‐objective optimization ,which can reduce the maximum damage and forming load effectively ,and w hat is more ,the material utilization is improved significantly .
出处
《华中科技大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2015年第3期63-68,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
中央高校基本科研业务费专项资金资助项目(CDJZR13130082)
关键词
锻造
工艺参数
微观组织
热加工图
响应面
多目标优化
forging
technological parameter
microstructure
processing map
response surface
multi-objective optimization